I think this is still an outstanding issue... I would really, REALLY like to be able to simply have a metronome rather than the canned Jazz/Latin/Pop styles. I play the bass with old-time music, and the default styles are simply unusable for me. The playback feature is severely crippled if there's no audible reference. If I turn down the drums and so forth that clash with the simple I-V beat, there is basically no audio left.

A simple metronome should be available, either as one of the available styles or as a configuration setting that plays it in conjunction with a style (which should give the option of 'no style' in the menu, allowing one to just have the metronome).

This seems to be a rather longstanding request. The forced styles (without a simple beat) is really my only disappointment with this app.